MPD

• Maui Police Department, Maui, Hawaii
• Memphis Police Department, Memphis, Tennessee
• Metropolitan Police Department of the District of Columbia, Washington, District of Columbia
• Miami Police Department, Miami, Florida
• Milwaukee Police Department, Milwaukee, Wisconsin
• Minneapolis Police Department, Minneapolis, Minnesota

• Manila Police District, Manila, the Philippines
• Metropolitan Police District, the area policed by the Metropolitan Police Service in London, United Kingdom
• Montreal Police Department, Montreal, Canada
• Tokyo Metropolitan Police Department, Tokyo, Japan

• Movement for Democracy (Cape Verde), a political party in Cape Verde
• Movimiento Popular Democrático, a political party in Ecuador

• Magnetoplasmadynamic thruster, an electric space propulsion engine
• Mesoscale precipitation discussion, a short-term meteorological forecast issued by the Weather Prediction Center concerning heavy precipitation and flash flooding
• Multivariate Pólya distribution, a statistical distribution
• Mouse Phenome Database, an online database of laboratory mouse characterizations

• 2-Methyl-2,4-pentanediol
• m-Phenylenediamine
• Methylphenidate

• Multiple personality disorder, a no longer accurate diagnosis for the mental disorder: dissociative identity disorder and other specified dissociative disorder
• Myeloproliferative disease, a group of diseases of the bone marrow
• Maximum permissible dose, of radiation

• MPD (programming language), a concurrent programming language
• Music Player Daemon, a music-player server
• Media Presentation Description, segment information in the streaming technique Dynamic Adaptive Streaming over HTTP (DASH)

• Managed Pressure Drilling, an adaptive oil drilling process
• Memory Protection Devices, a company that manufactures battery holders
• A range of MIDI pad controllers made by Akai

• Moonee Ponds railway station, Melbourne
• Motive power depot, a location used to store locomotives
• UTA MPD, a type of diesel multiple unit railcar of Northern Ireland Railways
• Air Comet, by ICAO airline designator

• Markovian Parallax Denigrate, a 1996 internet mystery
• Metres above principal datum (mPD), a surveying term; see sea level

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